Electrospun polyacrylonitrile nanofibers functionalized with EDTA for adsorption of ionic dyes
Autor: | Eutilério F.C. Chaúque, Adedeji A. Adelodun, Langelihle N. Dlamini, Corinne J. Greyling, J. Catherine Ngila |
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Rok vydání: | 2017 |
Předmět: |
Langmuir
Chemistry Polyacrylonitrile Ethylenediaminetetraacetic acid 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Geophysics Adsorption Geochemistry and Petrology Nanofiber Polymer chemistry Methyl orange Surface modification Freundlich equation 0210 nano-technology Nuclear chemistry |
Zdroj: | Physics and Chemistry of the Earth, Parts A/B/C. 100:201-211 |
ISSN: | 1474-7065 |
Popis: | The manipulation of nanofibers’ surface chemistry could enhance their potential application toward the removal of ionic dyes in wastewater. For this purpose, surface modification of electrospun polyacrylonitrile (PAN) nanofibers with ethylenediaminetetraacetic acid (EDTA) and ethylenediamine (EDA) crosslinker was experimented. The functionalized EDTA-EDA-PAN nanofibers were characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) technique. The impregnation of EDA and EDTA chelating agents on the surface of PAN changed the distribution of nanofibers as proximity is increased (accompanied by reduced softness), but the nanofibrous structure of the pristine PAN nanofibers was not substantially altered. Adsorption equilibrium studies were performed with Freundlich, Langmuir and Temkin isotherm models with the former providing better correlation to the experimental data. The modified PAN nanofibers showed efficient sorption of methyl orange (MO) and reactive red (RR) from aqueous synthetic samples, evinced by the maximum adsorption capacities (at 25 °C) of 99.15 and 110.0 mg g−1, respectively. The fabricated nanofibers showed appreciable removal efficiency of the target dye sorptives from wastewater. However, the presence of high metal ions content affected the overall extraction of dyes from wastewater due to the depletion of the adsorbent's active adsorptive sites. |
Databáze: | OpenAIRE |
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